Sign up for an Award
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
The wet-dry line is design to tell people if the clothes is totally dry though visual sense rather than tactile sense when the clothes is hanging on the air.It will do a favour to the old people whose tactile sense is insensitive and the hands disabled person distinguish it easily.Theory:CuSO4·5H2O = CuSO4 + 5H2O